Spring Boot Actuator

1. Add Dependencies: Ensure you have the necessary dependencies in your pom.xml or build.gradle file. For Maven, it would look something like this:

   <dependency>
       <groupId>org.springdoc</groupId>
       <artifactId>springdoc-openapi-ui</artifactId>
       <version>1.6.14</version>
   </dependency>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-actuator</artifactId>
   </dependency>
   

2. Enable Actuator Endpoints in Swagger: You need to configure Springdoc OpenAPI to include Actuator endpoints. This can be done by setting the springdoc.show-actuator property to true in your application.properties or application.yml file:

   springdoc.show-actuator=true
   

3. Configure Swagger: Create a configuration class to set up Swagger. Here’s an example:

   import org.springdoc.core.GroupedOpenApi;
   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   
   @Configuration
   public class SwaggerConfig {
   
       @Bean
       public GroupedOpenApi actuatorApi() {
           return GroupedOpenApi.builder()
                   .group("actuator")
                   .pathsToMatch("/actuator/**")
                   .build();
       }
   }
   

4. Access Swagger UI: Once everything is set up, you can access the Swagger UI at http://localhost:8080/swagger-ui.html to see the Actuator endpoints documented.

Micrometer监控 Tomcat 线程

要在 Spring Boot 中配置监控 Tomcat 线程，可以使用 Micrometer 和 Spring Boot Actuator。以下是一个简单的配置步骤：

1. 添加依赖： 在 pom.xml 文件中添加 Micrometer 和 Actuator 的依赖：

<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-core</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

1. 启用 Actuator 端点： 在 application.properties 或 application.yml 文件中启用所需的 Actuator 端点：

management.endpoints.web.exposure.include=*
server.tomcat.mbeanregistry.enabled=true

1. 配置 Tomcat 线程监控： Spring Boot Actuator 默认会暴露一些 Tomcat 相关的指标。你可以通过访问 /actuator/metrics 端点来查看这些指标。例如，访问 http://localhost:8080/actuator/metrics/tomcat.threads.current 可以查看当前 Tomcat 线程数。

2. 查看指标： 你可以使用任何支持 Micrometer 的监控系统（如 Prometheus、Grafana）来收集和展示这些指标。